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AP Biology / Unit 6

Unit 6 · 12–16%

Gene Expression and Regulation

Information flows from DNA to RNA to protein, and cells decide when that flow runs.

Start first lessonUnit practice

Topics

  • DNA replication
  • Transcription and translation
  • Gene regulation
  • Mutations

Lessons

Key terms

Original practice

Marlow Works questions. If this unit does not have its own items yet, you will see other questions from the same course.

1 of 3Membranes · medium · multiple choice

A cell’s surface-area-to-volume ratio is important because it affects:

Original Marlow Works item — not a College Board question.

Take your time—this is practice, not a test.

Review checklist

  1. 01Track a base change from DNA to mRNA to a possible amino-acid change.
  2. 02Explain why a silent mutation can leave the protein unchanged.
  3. 03Give one example of regulation at transcription versus after.

Related resources

External links with reuse status. Marlow Works is independent and does not copy restricted exam or textbook material.

  • Official / link only

    AP Biology course page

    Official eight-unit framework, science practices, and lab resources.

    College Board · All rights reserved · accessed 2026-10-01

    Open source

  • Reference only — do not copy

    OpenStax Biology 2e

    Biology reference with commercial-use restrictions on the current publisher page.

    OpenStax · CC BY-NC-SA 4.0 with additional restrictions · accessed 2026-10-01

    Link only unless permission is obtained.

    Open source